Method for degrading heavy non-aqueous phase liquid component composite hydrochloric ether pollutants in underground water

A non-aqueous liquid, chlorinated hydrocarbon technology, applied in the treatment of polluted groundwater/leachate, water pollutants, water/sewage treatment, etc., can solve the problem that carbon tetrachloride and tetrachloroethylene are difficult to degrade and react Severely difficult to control, harsh reaction conditions and other problems, to achieve the effects of low cost, fast degradation rate and mild reaction conditions

Inactive Publication Date: 2016-03-16
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

This method has the advantages of fast reaction speed and complete degradation, but sometimes the reaction is violent and difficult to control, the reaction conditions are relatively harsh, and improper handling will cause secondary pollution
[0015] Due to the different degrees of difficulty in degrading chlorinated hydrocarbons in groundwater, such as

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In the aqueous solution that 40mL carbon tetrachloride pollution concentration is 10mg / L, add 2g sodium persulfate, seal, fully concussion reaction under room temperature, after reaction 2 days, measure the concentration of carbon tetrachloride with gas chromatograph, the result passes through the process of the present invention The degradation rate of the treated carbon tetrachloride was 0 after 2 days.

Embodiment 2

[0030] In the aqueous solution that 40mL carbon tetrachloride pollution concentration is 10mg / L, add 2g sodium persulfate and 0.067g sodium hydroxide, seal, fully shake reaction under room temperature, wherein the mol ratio of sodium persulfate and sodium hydroxide is 1: 0.2. Sampling after reacting 2 days, measure the concentration of carbon tetrachloride with gas chromatograph, the degradation rate of carbon tetrachloride after 2 days through the process of the present invention is 24.44% as a result.

Embodiment 3

[0032] Add 0.5 g of sodium persulfate and 0.504 g of sodium hydroxide to 40 mL of an aqueous solution with a carbon tetrachloride pollution concentration of 10 mg / L, seal it, and shake it fully at room temperature for reaction, wherein the molar ratio of sodium persulfate to sodium hydroxide is 1 :6. Sampling after reaction 3 days, measure the concentration of carbon tetrachloride with gas chromatograph, the degradation rate of carbon tetrachloride after 3 days through the process of the present invention is 32.77% as a result.

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Abstract

Provided is a method for degrading heavy non-aqueous phase liquid component composite hydrochloric ether pollutants in underground water. The steps are as follows: a mixture of sodium persulfate and sodium hydroxide is added into water containing composite hydrochloric ether pollutants, and degradation and restoration are carried out. The cost is low, and operation is simple, safe and practicable. The restoration reagent has stable chemical properties, the reaction conditions are mild, and the restoration reagent has universality in most of underground environments. Various hydrochloric ether kinds can be degraded, and have a representativeness of pollution of underground water by composite hydrochloric ether. The method has characteristics of high degradation efficiency, rapid degradation rate, nontoxic products and the like. The method is suitable for in-situ restoration of underground water composite hydrochloric ether pollutants, can be extended for restoration composite hydrochloric ether in soil or industrial waste water, and is widely applied.

Description

technical field [0001] The invention relates to a degradation repair technology for heavy non-aqueous liquid pollution in groundwater, in particular to a method for oxidizing and degrading heavy non-aqueous liquid components in groundwater with compound chlorinated hydrocarbon pollution by alkali-activated persulfate. Background technique [0002] Dense non-aqueous phase liquids (Densenon-aqueous phase liquids, DNAPLs) are water-insoluble hydrocarbons with a specific gravity greater than 1 that exist below the surface of the earth, including some organic compounds containing one or more chlorine, bromine or fluorine atoms. Most chlorinated hydrocarbons are common components of heavy non-aqueous liquids, which are characterized by high volatility, low water solubility, refractory degradation and low viscosity. As an important organic solvent, intermediate and chemical raw material, chlorinated hydrocarbons have been widely used in the production of pesticides, tanning, phar...

Claims

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Application Information

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IPC IPC(8): C02F1/58C02F101/36C02F103/06
CPCC02F1/58C02F2101/36C02F2103/06
Inventor 宋昕程莹莹徐坷坷
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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